The Greeks thought the Earth was at the center of the universe and when they saw the ‘wandering planets’ they made their models more complex and more difficult to follow, to try and fit their theory with reality. That theory was changed when 16th century Polish person called Nicolaus Copernicus and later affected by the German, Johannes Kepler, where they placed the sun in the center and not the Earth. Then, in the 17th century Italy, an astronomer called Galileo Galilei invented the telescope. He pointed it up at the night sky and then they could see the space in more detail. We now have gigantic telescopes that see so much better then the old ones.
Where did Galileo Galilei get the idea of a telescope? Where did Nicolaus Copernicus and Johannes Kepler get the theory of the sun in the middle of the universe?
I understand why astronomers were so interested in space.